Keywords: Tower.bridge.99.machinery.london.arp.jpg Tower Bridge machinery One of a pair of identical horizontal stationary steam engines built by Sir W G Armstrong Mitchell Company of Gateshead in 1894 Used to pump water at 750psi to the hydraulic machinery that worked the bascules of Tower Bridge It is a twin tandem compound engine fitted with Meyer expansion slide valves driving force pumps by the tail rods Arpingstone Horizontal steam engines Taken with Olympus C-750UZ Tower Bridge interior Expansion valves |